Injector device



March 12, 1957 1 J CAUBET 2,785,019

INJECTOR DEVICE I Filed Oct. 20, 1953 IN vE/v TOR (Ac; (/fS CA (/557- mu s1 4 United States Patent INJECTOR DEVICE Jacques Caubet, Courbevoie, France, assignor to Papeteriesde France, Paris, France, a corporation of France Application October 29, 1953, Serial No. 387,271

Claims priority, application France October 20, 1952 1 Claim. (Cl. 302i In many industries the problem arises of gathering up within a container a divided solid substance, a paste, a liquid or on occasion even a gas, for example, for the purpose of injecting the material under pressure into apparatus for the treatment, utilisation or reserve thereof.

A usual method consists in producing a stream of fluid within a venturi tube connected with the container, the material being sucked up from the container into the venturi tube and then onwards by reason of the reduced pressure created by the stream and then carried along at the pressure defined by the speed in the neck portion.

I Generally speaking the extracting fluid acts thereafter as a means for conveying the material towards the points of use.

Such an arrangement is applied, for example, to the manufacture of paper, where the wood chips being withdrawn from a container by a stream of liquid into a venturi tube, the chips being conveyed by the liquor into a washer, where they are treated with the liquor.

A similar process is frequently adopted for the conveyance of cement, the extracting and conveying fluid then being compressed air.

in the usual injector apparatus of this nature the width of the annular space reserved for the material results in an insufflcient'performance on the part of the venturi tube, and an increased delivery and pressure of the extracting fluid are rendered necessary for the purpose of efficient injection into the enclosed space under pressure or into the conveying conduits. In consequence there is a considerable consumption of energy. Furthermore, accumulations of material may become wedged between the venturi tube and the pipe system for the injection of the fluid, necessitating a dismantling of the apparatus.

The present invention has for its subject matter an injector device which is devoid of these drawbacks and in which, without impairing the operation, a greatly reduced consumption of energy is achieved.

The arrangement according to the invention is characterised more particularly in that a venturi delivery tube in respect of a material conveyed by a fluid is connected with a container carrying the material, and that a hollow shaft traversed by the fluid extends into the container and merges into a nozzle in the vicinity of the neck portion of the venturi tube, the said shaft being rotary and furnished with external blades, so that the material is moved from the container into the conduit both by the rotation of the blades as well as by the stream emerging from the said hollow shaft. By reason of this arrangement the consumption of energy necessary for the operation is considerably reduced. In addition the rotary blades prevent any untimely wedging of the material.

Unquestionably it has already been proposed, particularly in the case of a Fuller apparatus for carbon or pulverised cement, to move a pulverised material by means of an endless screw opposite a blower orifice, which passes the material towards the points of use.

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In arrangements of this nature, however, the ejection orifice or orifices have been separate from the endless screw, the orifice being in a fixed position and located away from the screw, which does not receive any fluid. In the arrangement on the other hand according to the invention it is the injection nozzle itself which is rotary and furnished with the external blades. Furthermore, in feeding apparatus of the Fuller type theoperation thereof necessitates the formation of a compact accumulation of material at the outlet from the screw. This accumulation possesses various drawbacks, such as a considerable expenditure of energy, rapid wear of the screw and a pronounced reduction of quality of the products, which greatly limit the field of use of this apparatus. On the other hand the arrangement according to the invention avoids by reason of its construction the disadvantages in question.

Other features of the invention will be apparent from the following description of a form of embodiment selected by way of example and given in conjunction with the accompanying drawing. This drawing shows a longitudinal section, with parts in elevation, of an injector according to the invention.

In the embodiment ilustrated, which refers to use of the invention as applied to an injector for wood chips in the manufacture of paper, the base of the injector is shown at 1.

At the extreme rear of the injector, or left in the drawing, the base 1 supports through the medium of arms 2 a fixed connection 3 for the admission of fluid. The connection 3 is a hollow member in the form of a truncated cone narrowing down towards the front. In the front annular end 4 of the connection 3 there is mounted to be rotary a hollow shaft 5.

The rear end 6 of the shaft 5 is treated with a particular sulphuration so-called sulfinuze along its outer surface, which engages with slight friction in the annular end 4, a suitable expanding packing 7 being inserted between the shaft 5 and a shoulder on the connection 3.

The end 4 of the connection 3 comprises an enlarged threaded sleeve 8, and a suitable gasket 9, composed for example of teflon, is disposed about the sulfinuzed hearing 6 of the shaft 5 and is held between the bearing and the sleeve 8 by a nut 11 which screws into the thread on the sleeve.

The shaft 5 is carried in two bearing blocks 11 mounted.

by. way of the supports 12 on the base 1. Each block 11 is in two parts and comprises antifriction bearings 13, against which there engage sulfinuzed bearings 14 on the shaft 5. The shaft 5 is secured against axial displacement by means of a ball bearing 15 held by a nut 16 between the shaft and one of the blocks 11 so as to take over the axial reaction of the shaft, whilst a holding ring 17 mounted on the shaft opposite one of the blocks 11 prevents a shifting of the shaft towards the front.

For the purpose of setting the shaft 5 into rotation a tangent wheel 18 is mounted on the shaft 5 between the two blocks 11 and meshes with an endless driving screw 19.

At its front end the shaft 5 extends into the interior of a container or bin 29, which is mounted on the base 1 and of which the rounded bottom is shown at 21 the rear wall at.22 and the front wall at 23, whilst the side walls are shown at 24.

An opening 25 provided in the rear wall 22 surrounds the shaft 5 in spaced relation thereto, and a ring 25 secured at 27 to the Wall 22 about the opening 2-5 is applied against a sulfinuzed bearing 28 on the shaft 5, a suitable packing 29 being secured between the bear- 3 ing 23 and the ring 26 by means of a nut 30 screwed into the ring.

A tubular outlet connection 31 secured to the front wall 23 of the bin by stay plates 32 communicates with the'bin and comprises from the rear towards the front a cylindrical section 33, a converging section 34 and a diverging section 35, the parts 34 and 35 forming a venturitube, the neck portion of which is shown at 36. A diverging conduit 37 i connected by flanges as'at 38 to the section 35 in the extension of the latter.

The hollow shaft extends not only into the bin 29, but also into the interior of the sections 33 and 34 of the outlet connection 31, the front extremity 39 of the shaft 5 being convergent and being disposed in slightly spaced relation to the rear of the neck portion 36 of the venturi tube.

Within the bin 2% and the section 31. a helixcomprising two convolutions is secured about the hollow shaft 5 and extends up to the immediate neighbourhood of the rounded bottom 21 and of the section 31. One convolution 4% extends between the rear wall 22 of the bin and the end 39, whilst the other convolution 41 extends between a region of the shaft 5 comprised between the walls 22 and 23 and the end 39.

p The apparatus thus constructed is capable of being employed in the papermaking art as an injector or feeding means for passing wood chips, which are conveyed by a current of acid liquor, into a washer under pressure, where the chips are treated.

For this purpose the bin 2b is connected by upper flanges 42 to a conduit (not shown), this conduit and the bin 2d being filled with chips coming from a steaming chamber, where the chips, directed from a feed hopper, are subjected to'a vapour bath at low pressure.

The feed connection 3 of the injector device is connected with a conduit (not shown) for feeding an acid liquor, this conduit being furnished with a pump for delivery of the liquor into the connection 3.

The outlet pipe 37 from the injector device, traversed by a mixture of liquor and chips, feeds a washer, where the chips are subiected to treatment with the liquor. The pressure in the washer, which depends on the delivery end 39. This stream, which moves right in front of the neck portion 36 of the venturi tube, enables the pressure to be reduced below that prevailing in the bin 20, and in consequence the chips contained in the latter are delivered through the annular space between the outlet connection 31 and the shaft 5 into the pipe 37, where they are conveyed by the liquor. At the same time, however, the convolution 49 of the helix directs towards this space the chips which the double convolution 41 a has advanced up to the end of the shaft 5. The com bination of the stream at 39 and the movement of the helix about the hollow shaft from which the stream issues ensures a feeding of chips without risk to the pipe 37 with a reduced consumption of energy." There will be appreciated the considerable reduction in the power of the pump effecting delivery into the hollow shaft 5, which permits of the enforced advance of the chips by the helix, an advance which calls for a very low mechanical power.

It will be understood that the invention is not limited to the embodiment described and illustrated, but includes all possible modifications in the embodiment of its various parts.

.What I claim is:

In an apparatus for conveying wood chips by a current of acid liquor in the manufacture of paper, the combination of a hollow rotary shaft having its outlet portion convergent, convolutions forming blades .on one portion of the shaft, means for rotating said shaft, a conduit at one end of the shaft for conveying'a stream of liquid into said shaft, a container for wood chips extending around the shaft and around a portion of the convolu- -tions,'a' venturi delivery tube projecting outwardly from and the pressure in the pipe 37 must normally be maintained substantially higher than the pressure prevailing in the steaming chamber aforesaid.

The injector device according to the invention, in contradistinction to injectors of the usual kind, enables this condition to be readily fulfilled with a reduced con sumption of energy and without impairing the operation.

In operation the hollow shaft 5 is set into rotation by the screw 1.9 and is traversed towards the front by the said liquor, which is converted at 39 into a rapid and powerful stream owing to the converging form of the one side of the container and surrounding the outlet portion of the hollow shaft and portions of the convolutions projecting beyond the container, said convolutions converge and extend to said outlet end and within the venturi tube, and a second conduit connected with the outlet of the venturi tube for conveying the wood chips under pressure of the stream of liquid forced through the hollow shaft.

References Cited in the file of this patent UNITED STATES PATENTS Dunn Jan. 2, 

